Lexington, consolidated with Fayette County, is the second-largest city in Kentucky and the 61st largest in the United States. Known as the Horse Capital of the World, it is the heart of the state's Bluegrass region.
Effector. Definition. noun, plural: effectors. (biochemistry) A molecule that binds to a protein and affects the function of that protein. (physiology) An organ, a gland, or a muscle that can respond and becomes active in response to a stimulus (e.g. nerve impulse).upplement. In biochemistry, an effector is that molecule that binds to a specific protein, and regulates the latter's biological activity. An effector molecule acts as a ligand that is capable of increasing or decreasing the activity of that protein.
With inducible systems, the binding of the effector molecule to the repressor greatly reduces the affinity of the repressor for the operator, the repressor is released and transcription proceeds. The lac operon is an example of an inducible system(induced in the presence of lactose).With repressible systems, the binding of the effector molecule to the repressor greatly increases the affinity of repressor for the operator and the repressor binds and stops transcription.epressible: Repressible genes are those in which the presence of a substance (a co-repressor) in the environment turns off the expression of those genes (structural genes) involved in the metabolism of that substance. e.g., Tryptophan represses the expression of the trp genes.